get Available Countries
fun getAvailableCountries(installed: Boolean, listener: MapListResultListener): MapInstaller.Task
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Fetches all currently available maps. When finished, it calls the listener with the list of available map ISO codes or operation result if fetching failed.
Return
Task of current running operation which can be cancelled
Parameters
installed
whether to fetch only installed maps on the device
listener
listener that will be called with the result when the operation finishes